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ADS62P42IRGCT空采偏置的问题

ADS62P42IRGCT 是一款双通道的ADC,前端电路的设计按照datasheet上的参考电路设计,如下。

当测试电路的idle noise时,第一通道的偏置在15左右,而通道2几乎接近100。考虑到两个通道的幅度一致性,在保证参考电路中两个25欧姆电阻的和不变的同时,调整其电阻比例。但是通道2的idle noise基本不变。有没有什么办法能够调整通道2的空采偏置呢?